The Google Authenticator project includes implementations of one-time passcode generators for several mobile platforms, as well as a pluggable authentication module (PAM). One-time passcodes are generated using open standards developed by the Initiative for Open Authentication (OATH). These implementations support the HMAC-Based One-time Password (HOTP) algorithm specified in RFC 4226 and the Time-based One-time Password (TOTP) algorithm specified in RFC 6238. 

Google Authenticator - Two factor authentication

KeyBox is an open-source web-based SSH console that centrally manages administrative access to systems. Web-based administration is combined with management and distribution of user's public SSH keys. Key management and administration is based on profiles assigned to defined users. KeyBox layers TLS/SSL on top of SSH and acts as a bastion host for administration. Protocols are stacked (TLS/SSL + SSH) so infrastructure cannot be exposed through tunneling / port forwarding. 

KeyBox - Web-based SSH console that centrally manages administrative access to systems

pac4j  is a Java security engine to authenticate users, get their profiles and manage their authorizations in order to secure Java web applications. It supports most authentication mechanisms: OAuth (Facebook, Twitter, Google, Yahoo...), CAS, HTTP (form, basic auth...), OpenID, SAML, Google App Engine, OpenID Connect, JWT, LDAP, RDBMS, MongoDB and Stormpath and authorization checks.


pac4j - The security engine to protect all your Java web applications

Jasypt is a java library which allows the developer to add basic encryption capabilities to his/her projects with minimum effort, and without the need of having deep knowledge on how cryptography works. It provides unidirectional (digest) and bidirectional encryption techniques. It could encrypt text, byte arrays, objects, files etc. It could be integrated with Spring, Apache wicket.

Jasypt - Java Simplified Encryption

KeyczarKeyczar is an open source cryptographic toolkit designed to make it easier and safer for devlopers to use cryptography in their applications. Keyczar supports authentication and encryption with both symmetric and asymmetric keys. Keyczar was originally developed by members of the Google Security Team. 
 
Keyczar is designed to be open, extensible, and cross-platform compatible. It is not intended to replace existing cryptographic libraries like OpenSSL, PyCrypto, or the Java JCE, and in fact is built on these libraries.

KeyczarKeyczar is an open source cryptographic toolkit designed to make it easier and safer for devlopers to use cryptography in their applications. Keyczar supports authentication and encryption with both symmetric and asymmetric keys. Keyczar was originally developed by members of the Google Security Team. 

Keyczar - Toolkit for safe and simple cryptography

Apache Oltu is an OAuth protocol implementation in Java. It also covers others "OAuth family" related implementations such as JWT, JWS and OpenID Connect.

Apache Oltu - OAuth protocol implementation in Java

Metron integrates a variety of open source big data technologies in order to offer a centralized tool for security monitoring and analysis. Metron provides capabilities for log aggregation, full packet capture indexing, storage, advanced behavioral analytics and data enrichment, while applying the most current threat intelligence information to security telemetry within a single platform.
 
Metron will provide next generation defense techniques that consists of using a class of anomaly detection and machine learning algorithms that can be applied in real-time as events are streaming in.

Metron integrates a variety of open source big data technologies in order to offer a centralized tool for security monitoring and analysis. Metron provides capabilities for log aggregation, full packet capture indexing, storage, advanced behavioral analytics and data enrichment, while applying the most current threat intelligence information to security telemetry within a single platform.

Apache Metron - Real-time Big Data Security 

Dependency-Track is an intelligent Component Analysis platform that allows organizations to identify and reduce risk in the software supply chain. Dependency-Track takes a unique and highly beneficial approach by leveraging the capabilities of Software Bill of Materials (SBOM). This approach provides capabilities that traditional Software Composition Analysis (SCA) solutions cannot achieve.
 
Dependency-Track monitors component usage across all versions of every application in its portfolio in order to proactively identify risk across an organization. The platform has an API-first design and is ideal for use in CI/CD environments.

Dependency-Track is an intelligent Component Analysis platform that allows organizations to identify and reduce risk in the software supply chain. Dependency-Track takes a unique and highly beneficial approach by leveraging the capabilities of Software Bill of Materials (SBOM). This approach provides capabilities that traditional Software Composition Analysis (SCA) solutions cannot achieve.

Dependency-Track - Intelligent Component Analysis platform that allows organizations to identify and reduce risk in the software supply chain

Apache Shiro is a powerful and easy-to-use Java security framework that performs authentication, authorization, cryptography, and session management. With Shiro’s easy-to-understand API, you can quickly and easily secure any JVM-based application – from the smallest mobile applications to the largest web and enterprise applications.

Apache Shiro - Java Security Framework

Search Guard is an Elasticsearch plugin that offers encryption, authentication, and authorization. It builds on Search Guard SSL and provides pluggable authentication and authorization modules in addition. Search Guard is fully compatible with Kibana, Logstash and Beats.
 
Search Guard offers TLS on transport, HTTP Basic Authentication, JSON web token, Document- and Field-level security, Audit logging, REST management API, Fine-grained role- and index-based access control and lot more.

Search Guard is an Elasticsearch plugin that offers encryption, authentication, and authorization. It builds on Search Guard SSL and provides pluggable authentication and authorization modules in addition. Search Guard is fully compatible with Kibana, Logstash and Beats.

Search Guard -  Elasticsearch plugin that offers encryption, authentication, and authorisation

Ranger is a framework to enable, monitor and manage comprehensive data security across the Hadoop platform. It provides centralized security administration to manage all security related tasks in a central UI or using REST APIs, Fine grained authorization, Centralize auditing of user access within Apache Hadoop, Apache Hive, Apache HBase and other Apache components.

Ranger - Manage Data Security across the Hadoop Platform

Password4j is a Java user-friendly cryptographic library for hashing and checking passwords with different Key derivation functions (KDFs) and Cryptographic hash functions (CHFs). The library fully supports Argon2, BCrypt, SCrypt and PBKDF2 and can produce and handle cryptographic salt and pepper.

Password4j - Cryptographic library that supports Argon2, Bcrypt, Scrypt, PBKDF2 and various cryptographic hash functions. 

A Java library that keeps OAuth 2.0 service access tokens in memory for your usage.
    

tokens - Java library for conveniently verifying and storing OAuth 2.0 service access tokens

OAuth2 provider microservices based on Light-Java and SQL

light-oauth2 - A fast, light and cloud native OAuth 2

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